Glazing for motor vehicles

Abstract

The invention relates to a laminated glass panel for an automobile, having a curved shape resulting from the assembly of a first glass sheet, which is curved before said assembly, with an intermediate thermoplastic sheet and a second glass sheet, the thickness of which does not exceed one third of that of the first sheet, the second glass sheet not being curved, or having a curvature that is substantially smaller than that of the first sheet before the assembly thereof with the latter and the intermediate thermoplastic sheet.

The invention claimed is: 
     
       1. A laminated curved automotive glazing assembly, comprising:
 a first glass sheet initially curved in this assembly, 
 a thermoplastic interlayer sheet, and 
 a second glass sheet with a thickness that is not greater than a third of that of the first sheet, 
 wherein the second glass sheet does not have a curvature, or has a curvature that is less than that of the first sheet, before its assembly with the first glass sheet and the thermoplastic interlayer sheet, 
 wherein in the assembly the second glass sheet has a surface stress that is not more than 50 MPa, and 
 wherein a total thickness of the first glass sheet, thermoplastic interlayer, and second glass sheet is not more than 2.8 mm. 
 
     
     
       2. The glazing according to  claim 1 , wherein the first glass sheet has a thickness that is not more than 2.1 mm. 
     
     
       3. The glazing according to  claim 1 , wherein the thickness of the second glass sheet is not more than 0.8 mm. 
     
     
       4. The glazing according to  claim 1 , wherein the thickness of the second sheet is not less than 0.2 mm. 
     
     
       5. The glazing according to  claim 1 , wherein the curvature of the first glass sheet is cylindrical and a radius of curvature is not less than 1 m. 
     
     
       6. The glazing according to  claim 1 , wherein the second glass sheet is not curved before assembly. 
     
     
       7. The glazing according to  claim 1 , wherein the interlayer sheet has a thickness that is not more than 0.8 mm. 
     
     
       8. The glazing according to  claim 1 , wherein at least the second glass sheet is chemically toughened. 
     
     
       9. The glazing according to  claim 1 , wherein the second glass sheet bears a system of functional layers and the system of layers comprises a layer system for filtering infrared rays on a face in contact with the thermoplastic interlayer. 
     
     
       10. The glazing according to  claim 1 , forming a side window of a motor vehicle. 
     
     
       11. The glazing according to  claim 1 , wherein the thickness of the second glass sheet is not greater than a fourth of that of the first glass sheet. 
     
     
       12. The glazing according to  claim 1 , wherein in the assembly the surface stress of the second glass sheet is not more than 30 MPa. 
     
     
       13. The glazing according to  claim 1 , wherein in the assembly the surface stress of the second glass sheet is not more than 20 MPa. 
     
     
       14. The glazing according to  claim 1 , wherein in the assembly the surface stress of the second glass sheet is not more than 10 MPa. 
     
     
       15. The glazing according to  claim 1 , wherein the curvature of the first glass sheet is cylindrical and a radius of curvature is not less than 1.5 m.